Ouka is the great empire that rules over 1/3 of the world. To prevent conflicts from the other countries, they hold the battle competition once every 8 years. In this competition, 5 candidates, known as "Patriots", from each countries are to battle against each other and the winners will be granted with fame and honor. This story follows Kurou, the boy who walks the same footsteps as his father to become the strongest patriot, along with his team . . .